June 2018 Update

Task/XML-XPath/C/xml-xpath.c

@@ -0,0 +1,57 @@
+/*Abhishek Ghosh, 10th March 2018*/
+
+#include <libxml/parser.h>
+#include <libxml/xpath.h>
+
+xmlDocPtr getdoc (char *docname) {
+	xmlDocPtr doc;
+	doc = xmlParseFile(docname);
+
+	return doc;
+}
+
+xmlXPathObjectPtr getnodeset (xmlDocPtr doc, xmlChar *xpath){
+	
+	xmlXPathContextPtr context;
+	xmlXPathObjectPtr result;
+
+	context = xmlXPathNewContext(doc);
+
+	result = xmlXPathEvalExpression(xpath, context);
+	xmlXPathFreeContext(context);
+
+	return result;
+}
+
+int main(int argc, char **argv) {
+
+	if (argc <= 2) {
+		printf("Usage: %s <XML Document Name> <XPath expression>\n", argv[0]);
+		return 0;
+	}
+	
+	char *docname;
+	xmlDocPtr doc;
+	xmlChar *xpath = (xmlChar*) argv[2];
+	xmlNodeSetPtr nodeset;
+	xmlXPathObjectPtr result;
+	int i;
+	xmlChar *keyword;
+
+	docname = argv[1];
+	doc = getdoc(docname);
+	result = getnodeset (doc, xpath);
+	if (result) {
+		nodeset = result->nodesetval;
+		for (i=0; i < nodeset->nodeNr; i++) {
+		xmlNodePtr titleNode = nodeset->nodeTab[i];
+		keyword = xmlNodeListGetString(doc, titleNode->xmlChildrenNode, 1);
+		printf("Value %d: %s\n",i+1, keyword);
+		xmlFree(keyword);
+		}
+		xmlXPathFreeObject (result);
+	}
+	xmlFreeDoc(doc);
+	xmlCleanupParser();
+	return 0;
+}